// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package dfp.axis.v201405.forecastservice;

import com.google.api.ads.common.lib.auth.OfflineCredentials;
import com.google.api.ads.common.lib.auth.OfflineCredentials.Api;
import com.google.api.ads.dfp.axis.factory.DfpServices;
import com.google.api.ads.dfp.axis.v201405.Forecast;
import com.google.api.ads.dfp.axis.v201405.ForecastServiceInterface;
import com.google.api.ads.dfp.lib.client.DfpSession;
import com.google.api.client.auth.oauth2.Credential;

/**
 * This example gets a forecast for an existing line item. To determine which
 * line items exist, run GetAllLineItems.java.
 *
 * Credentials and properties in {@code fromFile()} are pulled from the
 * "ads.properties" file. See README for more info.
 *
 * Tags: ForecastService.getForecastById
 *
 * @author Adam Rogal
 */
public class GetForecastForLineItem {

  // Set the ID of the line item to get a forecast for.
  private static final String LINE_ITEM_ID = "INSERT_LINE_ITEM_ID_HERE";

  public static void runExample(DfpServices dfpServices, DfpSession session, long lineItemId)
      throws Exception {
    // Get the ForecastService.
    ForecastServiceInterface forecastService =
        dfpServices.get(session, ForecastServiceInterface.class);

    // Get forecast for line item.
    Forecast forecast = forecastService.getForecastById(lineItemId);

    long matched = forecast.getMatchedUnits();
    double availablePercent = (forecast.getAvailableUnits() / (matched * 1.0)) * 100;
    String unitType = forecast.getUnitType().toString().toLowerCase();

    System.out.printf("%d %s matched.\n", matched, unitType);
    System.out.printf("%.2f%% %s available.\n", availablePercent, unitType);

    if (forecast.getPossibleUnits() != null) {
      double possiblePercent = (forecast.getPossibleUnits() / (matched * 1.0)) * 100;
      System.out.printf("%.2f%% %s possible.\n", possiblePercent, unitType);
    }

    System.out.printf("%d contending line items.\n",
        forecast.getContendingLineItems() == null ? 0 : forecast.getContendingLineItems().length);
  }

  public static void main(String[] args) throws Exception {
    // Generate a refreshable OAuth2 credential similar to a ClientLogin token
    // and can be used in place of a service account.
    Credential oAuth2Credential = new OfflineCredentials.Builder()
        .forApi(Api.DFP)
        .fromFile()
        .build()
        .generateCredential();

    // Construct a DfpSession.
    DfpSession session = new DfpSession.Builder()
        .fromFile()
        .withOAuth2Credential(oAuth2Credential)
        .build();

    DfpServices dfpServices = new DfpServices();

    runExample(dfpServices, session, Long.parseLong(LINE_ITEM_ID));
  }
}
